Quarter Hertz lines, E11 run
E11 run
- 261 uncalibrated SFTs were produced
- no evidence of 0.25 Hz from averaging - would not expect for individual lines to be seen
from averaging so few SFTs
- So far little evidence for 0.25 Hz lines from Spectrum folding method
- SpectrumFold identified 21 SFTs (out of 261) with indications of 0.25 Hz comb.
Strongest three SFT start times: 785205600, 785311633, 785312533
- However there is some positive power excess in bin 0 mod 0.25Hz, possibly due to something else.
- Averaging SpectrumFold results shows weak indication of non-uniform distribution across bins mod 0.25 Hz (plots below).
- Furthermore the non-uniformity is more consistent with excess at (1/3600+0.25) Hz.
- There is stronger non-uniformity in the spectrum at mod 1/8 Hz and mod 1/16 Hz levels (last two plots).
E11 history of excess power
X axis is GPS seconds minus 751956483. Y axis is in arbitrary units.
bin 0 mod 0.25 Hz
bin 451 mod 0.25 Hz
bin 55 mod 0.25 Hz (reference)
Averaged SpectrumFold plots:
X axis is frequency mod 0.25 Hz. Y axis is in arbitrary units.
E11 H1
S3 H1
(for comparison, 261 SFTs averaged (i.e. same number of SFTs as E11) from the end of the run)
E11 H1, using mod 1/16.0714 Hz SpectrumFold (as opposed to 1/4=0.25 Hz)
E11 H1, using mod 1/8 Hz SpectrumFold (as opposed to 1/4=0.25 Hz)
E11 H1, using mod 0.53 Hz SpectrumFold (as opposed to 1/4=0.25 Hz)
